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The lensing and temperature imprints of voids on the cosmic microwave background

Cai, Yan-Chuan; Neyrinck, Mark; Mao, Qingqing; Peacock, John A.; Szapudi, Istvan; Berlind, Andreas A.

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Authors

Yan-Chuan Cai

Mark Neyrinck

Qingqing Mao

John A. Peacock

Istvan Szapudi

Andreas A. Berlind



Abstract

We have searched for the signature of cosmic voids in the cosmic microwave background (CMB), in both the Planck temperature and lensing-convergence maps; voids should give decrements in both. We use ZOBOV voids from the Data Release 12 Sloan Digital Sky Survey CMASS galaxy sample. We base our analysis on N-body simulations, to avoid a posteriori bias. For the first time, we detect the signature of voids in CMB lensing: the significance is 3.2σ, close to Λ cold dark matter (ΛCDM) in both amplitude and projected density-profile shape. A temperature dip is also seen, at modest significance (2.3σ), with an amplitude about six times the prediction. This temperature signal is induced mostly by voids with radii between 100 and 150 h−1 Mpc, while the lensing signal is mostly contributed by smaller voids – as expected; lensing relates directly to density, while integrated Sachs–Wolfe effect (ISW) depends on gravitational potential. The void abundance in observations and simulations agree as well. We also repeated the analysis excluding lower significance voids: no lensing signal is detected with an upper limit of about twice the ΛCDM prediction. But the mean temperature decrement now becomes non-zero at the 3.7σ level (similar to that found by Granett et al.), with an amplitude about 20 times the prediction. However, the observed dependence of temperature on void size is in poor agreement with simulations, whereas the lensing results are consistent with ΛCDM theory. Thus, the overall tension between theory and observations does not favour non-standard theories of gravity, despite the hints of an enhanced amplitude for the ISW effect from voids.

Citation

Cai, Y., Neyrinck, M., Mao, Q., Peacock, J. A., Szapudi, I., & Berlind, A. A. (2017). The lensing and temperature imprints of voids on the cosmic microwave background. Monthly Notices of the Royal Astronomical Society, 466(3), 3364-3375. https://doi.org/10.1093/mnras/stw3299

Journal Article Type Article
Acceptance Date Dec 12, 2016
Online Publication Date Dec 17, 2016
Publication Date Apr 21, 2017
Deposit Date Jul 25, 2017
Publicly Available Date Jul 25, 2017
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 466
Issue 3
Pages 3364-3375
DOI https://doi.org/10.1093/mnras/stw3299
Public URL https://durham-repository.worktribe.com/output/1372856

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Copyright Statement
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society ©: 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.






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